Hand Reamers. Used for hand reaming for final sizing and finishing of holes. Ground with a starting taper for easy entry into the hole. Shankd are the same size the reamer size and are supplied with a square end for holding in a tap wrench or vise.Diameter Tolerances• Up to 1/2 -- +.0002/-0• over 1/2 to 5/8 -- +.0003/-0• over 5/8 to 1-1/2 -- +.0001/+.0004.